schoolbag = ['语文书','数学书','练习本','笔盒']
schoolbag1 = schoolbag
print(schoolbag,schoolbag1)
schoolbag[0] = '英语书'
print(schoolbag ,schoolbag1)



schoolbag = ['语文书','数学书','英语书','漫画书']
length = len(schoolbag)
i = 0
while i < length :
    print(schoolbag[i])
    i += 1



schoolbag = ['语文书','数学书','英语书','漫画书']
for item in  schoolbag:
    print(item)

schoolbag = ['语文书','数学书','英语书','漫画书']
penbox = ['铅笔','油笔','橡皮']
print(penbox)

schoolbag.extend(workbook)
print(schoolbag)
schoolbag.
